Improvement



S. E. TODD.

Tile-Machines.

SAMUEL E, TODD, OF BRIDGEIORT, CONNECTICUT.

IMPROVEMENT la TILE-MACHINES.

Specification forming part of Letters Patent No. ligb, dated April 21,1874; application led March 18, 1874.

To all whom it may concern:

Be it known that I, SAMUEL E. Tom), of Bridgeport, in the county of'Fairfield and State of Connecticut, have invented certain new anduseful Improvements in Ooresused in the Manufacture of Drain-Pipe, Src.;and I do hereby declare that the following is a full, clear, and exactdescription thereof, that will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

Figure l is a side elevation. Fig. 2 is a top plan.

Same letters show like parts.

The object of my invention is to produce certain improvements in thecores used in the manufacture of cement and other pipes used fordrainage, &c.

One of the difficulties experienced in the manufacture particularly ofhydraulic-cement pipes is that of accomplishing the removal of the corefrom the joint of pipe soon after it is molded, and while the piperemains within the case or mold. My invention is intended to obviatethis difficulty.

The core which I employ is made of wood for the sake of cheapness. Suchcores, if brought in contact with the cement, become roughened, andaffect injuriously the interior surface of the pipe. The protector isemployed to prevent the cement acting upon the wooden core, and tofacilitate'the removal of the core from the pipe.

My invention consists in the combination of a core and core-protector.

In the accompanying drawings, A shows vthe core-protector, and B thecore. The core is placed within the protector, and is some what longerthan it. The core is slightly tapering or conical, being so made forconven ience of removal, either upward or downward, as hereinafter setforth.

It should be specified that for a device to keep the core andcore-protector in place, I employ a circular aperture, conforming in itssize to that of the protector at the bottom. Into this aperture I thenplace one end of the core, surrounded by the core-protector, whichtogether fill the aperture. On the under side of the aperture, intowhich the protector fits, I place a slide, which, when withdrawn, allowsthe core, sliding through the protector, to drop into an excavationbeneath the circular aperture; or the core may be placed within theprotector with its largest end upward, and, instead of dropping downthrough the protector, be lifted up through it by a handle on the upperend.

Then a joint of pipe is to be molded, the core and protector are iirstplaced in the aperture, as hereinbefore described. The mold is thenproperly placed around the core, and the material forming the pipe isthen filled in and tamped in the space between the protector and thecase, as common.

After the pipe is completed and suflicient time has elapsed for theremoval of the core,

the operation is performed as follows: If the core is removed downward,then, the slide upon which it rests being drawn out, the core is causedto slide through the protector and to drop into the excavation beneaththe aperture. If the largest end of the core is placed in the upper endof the pipe, then the core is lifted up through the protector. Theprotector is then lifted upward through the bore of the newly-formedjoint of pipe.

It will be observed that the core is solid, and with my protector may bemade of wood, or any convenient material, inasmuch as it is not broughtin contact with the cement, and not subjected to moisture.

The protector is formed of a cylinder or other forms, of sheet metal, ofone or more pieces, with loose overlapping edges, as shown at a., thusmaking a smooth interior surface.

My invention possesses the advantages of presenting a polished surfacefor the formation of the bore of the pipe, of permitting the removal ofthe core without fracture of the pipe; of firmness to resist thecompression of the material around the core; and of cheapness inmanufacture, and at the same time allowing the core being freelyremoved.

I do not claim any device for keeping an elastic or flexible coreexpanded. My core is i arrnfivr @Frien- 1n ade of solid Wood and isunyielding. Neither do I claim an elastic or iiexible core.

VVhzLt I claim as mjy invention7 and desire to secure by Letters Patent,is-

The pipe-mold core consisting of the Wooden cylinder, surrounded by thesheet-metzt1 prorector7 substantie-Hy as described.

In' testimonyY that I claim the foregoing I have hereunto set my handthis 28th day of February, 1874.

SAML. E. TODD. Vitnesses:

WILLIAM HENRY CLIFFORD, SEYMOUR L. PARKER.

